cannot talk to dongle after connect

[JimmyD]

I connect to the nRF52840-MDK dongle thru the Serial Terminal (nRF52 Connectivity) it found the comm port and set the baudrate automatically. However, the terminal window constantly fills up the screen with ~/ characters. it repeats every 1 second. What I would like is detailed instructions on how to configure this dongle to be a BT 5 sniffer and read the Extended Advertising for any BT device near the dongle. It would also be helpful to filter the devices seen. Eventually I like to use Python to filter the choices and obtain the advertises data where I can parse the data received. I'm using Windows 10 pro.

Thanks.

[JimmyD]

Could I add one more request about example.py? Testing would go much faster if it can print out only certain MAC address that starts with an address from a list of MAC addresses.

Example: print out D2:72:7B:D6 (remaining digits I don't care). I'll need about 6 MAC address to look for with different prefixes.

[JimmyD]

Before I forget, once the dongle finds and prints the device name and MAC address, I also need the data of the extended advertising.

Thanks.

Jim D

[JimmyD]

I haven't gotten an answer in 2 days, this is very important that I try to get this working in the next few days. A coworker has started to look into this and is searching for a way to accomplish this task. If he succeeds that means all the dongles we brought from you will go back for a return and will implement his method.

[ovrebekk]

Hi Jim

Sorry for the slow response. To be honest we don't get a lot of questions about these python bindings, and I have to learn as I go here

To verify your issue I tried to modify example.py myself, and I added some code to count not only the number of packets (like in the original file) but also the type of packet received. 

Essentially you can get the advertising type of every packet by referencing packet.blePacket.advType, and I made an array to keep count of how many packets I received by type:

# Takes list of packets
def processPackets(packets):
    for packet in packets:
        # packet is of type Packet
        # packet.blePacket is of type BlePacket
        global nPackets
        if packet.OK:
            # Counts number of packets which are not malformed.
            nPackets += 1
            nPacketsByType[packet.blePacket.advType] += 1

When running this script at first I didn't see any packets in index 7 (ADV_TYPE_ADV_EXT_IND), like expected. Then I flashed an nRF52DK with the periodic_adv sample from the nRF Connect SDK, and to my surprise I could now see the counter increase:

In other words it seems to me like extended advertise packets are enabled by default. 

Then my follow up question would be whether or not you are sure that there is actually something nearby sending extended advertise packets? 

Do you have some other means of checking this, such as a smart phone with extended advertising support running the nRF Connect for Mobile app?

Regarding specific requests to example.py, keep in mind that this file is just meant as a starting point. It is up to you to implement the functionality you need based on your project requirements. 

Please find my modified script attached below:

Fullscreen example_count_by_type.py Download

# Copyright (c) Nordic Semiconductor ASA
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#    software without specific prior written permission.
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#    Nordic Semiconductor ASA integrated circuit.
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# LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
# OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

import time
from SnifferAPI import Sniffer, UART

nPackets = 0
nPacketsByType = [0,0,0,0,0,0,0,0]
mySniffer = None

def setup():
    global mySniffer
    
    # Find connected sniffers
    ports = UART.find_sniffer()
    
    if len(ports) > 0:
        # Initialize the sniffer on the first COM port found with baudrate 1000000.
        # If you are using an old firmware version <= 2.0.0, simply remove the baudrate parameter here.
        mySniffer = Sniffer.Sniffer(portnum=ports[0], baudrate=1000000)
    
    else:
        print("No sniffers found!")
        return
    
    # Start the sniffer module. This call is mandatory.
    mySniffer.start()
    # Scan for new advertisers
    mySniffer.scan()

    # Wait to allow the sniffer to discover device mySniffer.
    #time.sleep(5)
    # Retrieve list of discovered devicemySniffer.
    #d = mySniffer.getDevices()
    # Find device with name "Example".
    #dev = d.find('Example')
    
    #if dev is not None:
        # Follow (sniff) device "Example". This call sends a REQ_FOLLOW command over UART.
    #    mySniffer.follow(dev)
    #else:
    #    print("Could not find device")

def loop():
    # Enter main loop
    nLoops = 0
    while True:
        time.sleep(0.1)
        # Get (pop) unprocessed BLE packets.
        packets = mySniffer.getPackets()
        
        processPackets(packets) # function defined below
        
        nLoops += 1
        
        # print diagnostics every so often
        if nLoops % 20 == 0:
            #print(mySniffer.getDevices())
            print("inConnection", mySniffer.inConnection)
            print("currentConnectRequest", mySniffer.currentConnectRequest)
            print("packetsInLastConnection", mySniffer.packetsInLastConnection)
            print("nPackets", nPackets)
            print("packet by type", nPacketsByType)
            print()
        
# Takes list of packets
def processPackets(packets):
    for packet in packets:
        # packet is of type Packet
        # packet.blePacket is of type BlePacket
        global nPackets
        if packet.OK:
            # Counts number of packets which are not malformed.
            nPackets += 1
            nPacketsByType[packet.blePacket.advType] += 1
    
setup()
if mySniffer is not None:
    loop()

Best regards
Torbjørn

[JimmyD]

Thanks for the response. Yes, I have a smart phone that shows the extended advertising along with all the data it is advertising. The closest I got was with Wireshark and there is an Extended advertising section but none of the data matched the phone's.. I will look at the code mod you sent and experiment. Thanks.